Shining brightly with a sparkling light; the present participle of glister used as an adjective to describe something that glitters.
From glister + present participle suffix '-ing'. This form became common in Early Modern English poetry as an alternative to 'glittering'.
Medieval poets preferred 'glistering' over 'glittering' because it has more syllables and creates a longer, more musical line when spoken aloud—making it perfect for epic poems about knights and treasure!
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